Successive type analog-to-digital converter with a variable refe

Details Successive type analog-to-digital converter with a variable refe Successive type analog-to-digital converter with a variable refe

1989-12-07

1991-07-02

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 146

Patent

active

050289268

ABSTRACT:
A successive approximation analog to digital converter is provided with a variable reference voltage. A comparator compares an analog input voltage and an analog comparison voltage to obtain a digital output signal. Before the analog comparison voltage becomes lower than the analog input voltage, the first time after the analog to digital conversion starts, the second digital signal is changed in response to a first clock signal to decrease the reference voltage so that the first digital signal output form the first register is not changed. After the analog comparison voltage becomes lower than the analog input voltage the first time after the analog to digital conversion starts, the second digital signal is not changed so that the reference voltage is kept constant. The first digital signal is then changed in response to a second clock signal and the digital output signal to change the analog comparison voltage, whereby the bit member of the digital-to-analog converter is reduced.

REFERENCES:
patent: 4196420 (1980-04-01), Culmer et al.
patent: 4314235 (1982-02-01), Ruf et al.
patent: 4647903 (1987-03-01), Ryu
patent: 4823130 (1989-04-01), Wright et al.

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